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If I were a SpringerVerlag Graduate Text in Mathematics, I would be J.P. Serre's A Course in Arithmetic.
JeanPierre Serre is Professor at the College de France. He has written a number of books, including "Algebraic Groups and Class Fields", "Local Fields", "Complex Semisimple Lie Algebras", "Linear Representations of Finite Groups", Collected Papers (3 volumes), and "Trees" published by SpringerVerlag.
Which Springer GTM would you be? The Springer GTM Test